SDI Open Water Scuba Diver Exam
Which of the following factors do we take into account when measuring waves? -
✔️✔️Height, Length
When water stratifies itself into layers, according to temperature, the boundary between
layers is known as a(n):
1: Halocline.
2: Ichtyocline.
3: Thermodyne.
4: Thermocline. - ✔️✔️Thermocline
Objects under water appear - ✔️✔️Closer and larger than they do on land
How much faster does sound travel in water, compared to air? - ✔️✔️4 times
Water conducts heat away from your body - ✔️✔️25 times faster than air does
As you descend - ✔️✔️colors fade, reds and oranges fade first, 30 meters seem blue
and gray
water temp does your body need thermal protection - ✔️✔️86 degrees
What does SCUBA mean - ✔️✔️self-contained underwater breathing apparatus
What is the primary cause of waves? - ✔️✔️wind
Which of the following is incorrect? - ✔️✔️Waves are not hazardous to divers during
shore dives
The consequences of becoming cold under water include the following except -
✔️✔️improved judgment and coordination
Because sound travels faster under water: - ✔️✔️Its harder to determine the direction
from which a sound is coming
Entering through surf requires special skills. These skills are often included in beginning
scuba course taught in areas in which surf entries are common - ✔️✔️true
, which of the following are true - ✔️✔️Surge is the back-and-forth movement of water
caused by passing over head
despite its apparent warmth, divers in warm waters still need to consider to wear
protection - ✔️✔️true
longshore currents always move in the same direction as prevailing offshore currents -
✔️✔️false
a rip current is a narrow flow of swiftly moving water that runs parallel to shore -
✔️✔️false
the trick to dealing with surge is to anticipate its action in order to avoid contact with
stationary objects - ✔️✔️true
what is the most effective way to get out of a rip current - ✔️✔️swim parallel to shore,
until out of current
the best time to dive is during a slack tide - ✔️✔️true
we pose greater threat to underwater plants and animals - ✔️✔️true
what causes most marine life injuries - ✔️✔️animals defense response and mistaken
identity
what ability best helps helps you avoid damage to the fragile aquatic environment -
✔️✔️buoyancy control
all of the following steps can you take to avoid scrapes and abrasions, except: -
✔️✔️wear minimal exposure protection
some aquatic animals possess stinging cells. These are called: - ✔️✔️Nematocysts
marine animals bites almost always the result of the animal defending itself - ✔️✔️true
always stay within your level of experience. As an open water diver you should not
venture in overhead environment such as a cave - ✔️✔️true
The states of buoyancy include all of the following except - ✔️✔️Passive
a scuba cylinder that normally lasts one hour at the surface will last ___ minutes at 20
meters - ✔️✔️20
Which of the following factors do we take into account when measuring waves? -
✔️✔️Height, Length
When water stratifies itself into layers, according to temperature, the boundary between
layers is known as a(n):
1: Halocline.
2: Ichtyocline.
3: Thermodyne.
4: Thermocline. - ✔️✔️Thermocline
Objects under water appear - ✔️✔️Closer and larger than they do on land
How much faster does sound travel in water, compared to air? - ✔️✔️4 times
Water conducts heat away from your body - ✔️✔️25 times faster than air does
As you descend - ✔️✔️colors fade, reds and oranges fade first, 30 meters seem blue
and gray
water temp does your body need thermal protection - ✔️✔️86 degrees
What does SCUBA mean - ✔️✔️self-contained underwater breathing apparatus
What is the primary cause of waves? - ✔️✔️wind
Which of the following is incorrect? - ✔️✔️Waves are not hazardous to divers during
shore dives
The consequences of becoming cold under water include the following except -
✔️✔️improved judgment and coordination
Because sound travels faster under water: - ✔️✔️Its harder to determine the direction
from which a sound is coming
Entering through surf requires special skills. These skills are often included in beginning
scuba course taught in areas in which surf entries are common - ✔️✔️true
, which of the following are true - ✔️✔️Surge is the back-and-forth movement of water
caused by passing over head
despite its apparent warmth, divers in warm waters still need to consider to wear
protection - ✔️✔️true
longshore currents always move in the same direction as prevailing offshore currents -
✔️✔️false
a rip current is a narrow flow of swiftly moving water that runs parallel to shore -
✔️✔️false
the trick to dealing with surge is to anticipate its action in order to avoid contact with
stationary objects - ✔️✔️true
what is the most effective way to get out of a rip current - ✔️✔️swim parallel to shore,
until out of current
the best time to dive is during a slack tide - ✔️✔️true
we pose greater threat to underwater plants and animals - ✔️✔️true
what causes most marine life injuries - ✔️✔️animals defense response and mistaken
identity
what ability best helps helps you avoid damage to the fragile aquatic environment -
✔️✔️buoyancy control
all of the following steps can you take to avoid scrapes and abrasions, except: -
✔️✔️wear minimal exposure protection
some aquatic animals possess stinging cells. These are called: - ✔️✔️Nematocysts
marine animals bites almost always the result of the animal defending itself - ✔️✔️true
always stay within your level of experience. As an open water diver you should not
venture in overhead environment such as a cave - ✔️✔️true
The states of buoyancy include all of the following except - ✔️✔️Passive
a scuba cylinder that normally lasts one hour at the surface will last ___ minutes at 20
meters - ✔️✔️20
